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A stretch blow bottle made from a polyester resin composition which comprises: (A) 60 to 99% by weight of a polyethylene terephthalate resin and (B) 1 to 40% by weight of a polyethylene isophthalate resin, wherein 300 square microns of a section exposed by cutting the neck of the bottle contains les

A stretch blow bottle made from a polyester resin composition which comprises: (A) 60 to 99% by weight of a polyethylene terephthalate resin and (B) 1 to 40% by weight of a polyethylene isophthalate resin, wherein 300 square microns of a section exposed by cutting the neck of the bottle contains less than one particle of the polyethylene isophthalate resin (B) having a diameter of 0.1 micron or above in the polyethylene terephthalate resin (A) as the matrix.

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1. A stretch blow bottle obtainable by the process comprising:melt-kneading (A) 60 to 99% by weight of a polyethylene terephthalate resin and (B) 1 to 40% by weight of a polyethylene isophthalate resin comprising dicarboxylic acid components and dihydroxy compound components under shear force using

1. A stretch blow bottle obtainable by the process comprising:melt-kneading (A) 60 to 99% by weight of a polyethylene terephthalate resin and (B) 1 to 40% by weight of a polyethylene isophthalate resin comprising dicarboxylic acid components and dihydroxy compound components under shear force using an extruder having a Dulmage screw, an extruder having a screw with a pin in its metering portion, an extruder having a polygonal cylinder section or a twin-screw extruder at a temperature of from 270.degree. C. to 315.degree. C. for a duration of from 60 seconds to 600 seconds, wherein the polyethylene isophthalate resin (B) comprises an isophthalic acid component, a terephthalic acid component, an ethylene glycol component and a 1,3-bis(2-hydroxethoxy)benzene component and the isophthalic acid component is contained in an amount of at least 50% on a molar basis relative to a total of 100% of the dicarboxylic acid components and the ethylene glycol component in an amount of not less than 50% on a molar basis relative to a total of 100% of the dihydroxy compound components; forming a preform from the resulting melt-kneaded mixture of the resins at a temperature of 250.degree. C. to 310.degree. C.; and stretch blow molding the preform to provide a stretch blow bottle wherein 300 square microns of a section exposed by cutting the neck of the bottle contains less than one particle of the polyethylene isophthalate resin (B) having a diameter of 0.1 micron or above in the polyethylene terephthalate resin (A) as the matrix.